GM Service Manual Online
For 1990-2009 cars only

Heated Seat System Components

The heated seats system consists of the following components:

    • The heated seat switch
    • The driver heated seat relay module
    • The passenger heated seat relay module
    • The driver heated seat thermistor
    • The passenger heated seat thermistor
    • The driver back cushion heater element
    • The driver seat cushion heater element
    • The passenger back cushion heater element
    • The passenger seat cushion heater element
    • The HVAC/DIC/DRL/HEATED SEAT 10A fuse
    • The PWR/HEATED SEAT PSD 30A circuit breaker

Heated Seat System Controls

The heated seats are controlled by the following components:

    • Headed seat switches
    • Heated seat relay modules

Heated Seat Operation

Ignition voltage is supplied the heated seat switches. When a heated seat switch is turned on, voltage is supplied through the heated seat switch signal circuits to the heated seat relay module terminals B and C. Battery positive voltage is supplied the heated seat relay modules. When the heated seat switch is turned on and the resistance through the heated seat thermistor is within acceptable limits, the relay module closes the battery positive supply circuit to the seat heater element supply circuit.